A three-dimensional image processing apparatus which obtains a three-dimensional image from a plurality of images from different projection views of a patient which have been obtained by carrying out multiple imaging while rotating around the patient, includes a locating unit to specify a point of one of the plurality of images from different projection views. A searching unit searches a point corresponding to the specified point in the plurality of images from different projection views, on the basis of the specified point. A reconstruction region identification unit identifies a region of a part of a region which can be reconstructed, as a reconstruction region by using the specified point and the searched point. A reconstruction unit obtains a three-dimensional image by reconstructing an image in the identified reconstruction region.